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1486 lines
35 KiB
1486 lines
35 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* inet_diag.c Module for monitoring INET transport protocols sockets. |
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* |
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* Authors: Alexey Kuznetsov, <[email protected]> |
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*/ |
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|
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/types.h> |
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#include <linux/fcntl.h> |
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#include <linux/random.h> |
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#include <linux/slab.h> |
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#include <linux/cache.h> |
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#include <linux/init.h> |
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#include <linux/time.h> |
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|
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#include <net/icmp.h> |
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#include <net/tcp.h> |
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#include <net/ipv6.h> |
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#include <net/inet_common.h> |
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#include <net/inet_connection_sock.h> |
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#include <net/inet_hashtables.h> |
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#include <net/inet_timewait_sock.h> |
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#include <net/inet6_hashtables.h> |
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#include <net/bpf_sk_storage.h> |
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#include <net/netlink.h> |
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|
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#include <linux/inet.h> |
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#include <linux/stddef.h> |
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|
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#include <linux/inet_diag.h> |
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#include <linux/sock_diag.h> |
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|
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static const struct inet_diag_handler **inet_diag_table; |
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|
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struct inet_diag_entry { |
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const __be32 *saddr; |
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const __be32 *daddr; |
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u16 sport; |
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u16 dport; |
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u16 family; |
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u16 userlocks; |
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u32 ifindex; |
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u32 mark; |
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#ifdef CONFIG_SOCK_CGROUP_DATA |
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u64 cgroup_id; |
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#endif |
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}; |
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|
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static DEFINE_MUTEX(inet_diag_table_mutex); |
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|
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static const struct inet_diag_handler *inet_diag_lock_handler(int proto) |
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{ |
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if (proto < 0 || proto >= IPPROTO_MAX) { |
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mutex_lock(&inet_diag_table_mutex); |
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return ERR_PTR(-ENOENT); |
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} |
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|
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if (!inet_diag_table[proto]) |
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sock_load_diag_module(AF_INET, proto); |
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|
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mutex_lock(&inet_diag_table_mutex); |
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if (!inet_diag_table[proto]) |
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return ERR_PTR(-ENOENT); |
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|
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return inet_diag_table[proto]; |
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} |
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|
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static void inet_diag_unlock_handler(const struct inet_diag_handler *handler) |
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{ |
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mutex_unlock(&inet_diag_table_mutex); |
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} |
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|
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void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk) |
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{ |
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r->idiag_family = sk->sk_family; |
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|
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r->id.idiag_sport = htons(sk->sk_num); |
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r->id.idiag_dport = sk->sk_dport; |
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r->id.idiag_if = sk->sk_bound_dev_if; |
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sock_diag_save_cookie(sk, r->id.idiag_cookie); |
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|
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#if IS_ENABLED(CONFIG_IPV6) |
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if (sk->sk_family == AF_INET6) { |
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*(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr; |
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*(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr; |
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} else |
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#endif |
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{ |
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memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src)); |
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memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst)); |
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|
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r->id.idiag_src[0] = sk->sk_rcv_saddr; |
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r->id.idiag_dst[0] = sk->sk_daddr; |
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} |
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} |
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EXPORT_SYMBOL_GPL(inet_diag_msg_common_fill); |
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|
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static size_t inet_sk_attr_size(struct sock *sk, |
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const struct inet_diag_req_v2 *req, |
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bool net_admin) |
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{ |
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const struct inet_diag_handler *handler; |
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size_t aux = 0; |
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|
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handler = inet_diag_table[req->sdiag_protocol]; |
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if (handler && handler->idiag_get_aux_size) |
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aux = handler->idiag_get_aux_size(sk, net_admin); |
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|
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return nla_total_size(sizeof(struct tcp_info)) |
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+ nla_total_size(sizeof(struct inet_diag_msg)) |
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+ inet_diag_msg_attrs_size() |
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+ nla_total_size(sizeof(struct inet_diag_meminfo)) |
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+ nla_total_size(SK_MEMINFO_VARS * sizeof(u32)) |
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+ nla_total_size(TCP_CA_NAME_MAX) |
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+ nla_total_size(sizeof(struct tcpvegas_info)) |
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+ aux |
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+ 64; |
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} |
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|
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int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb, |
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struct inet_diag_msg *r, int ext, |
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struct user_namespace *user_ns, |
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bool net_admin) |
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{ |
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const struct inet_sock *inet = inet_sk(sk); |
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struct inet_diag_sockopt inet_sockopt; |
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|
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if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown)) |
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goto errout; |
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|
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/* IPv6 dual-stack sockets use inet->tos for IPv4 connections, |
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* hence this needs to be included regardless of socket family. |
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*/ |
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if (ext & (1 << (INET_DIAG_TOS - 1))) |
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if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0) |
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goto errout; |
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|
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#if IS_ENABLED(CONFIG_IPV6) |
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if (r->idiag_family == AF_INET6) { |
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if (ext & (1 << (INET_DIAG_TCLASS - 1))) |
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if (nla_put_u8(skb, INET_DIAG_TCLASS, |
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inet6_sk(sk)->tclass) < 0) |
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goto errout; |
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|
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if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) && |
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nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk))) |
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goto errout; |
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} |
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#endif |
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|
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if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, sk->sk_mark)) |
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goto errout; |
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|
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if (ext & (1 << (INET_DIAG_CLASS_ID - 1)) || |
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ext & (1 << (INET_DIAG_TCLASS - 1))) { |
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u32 classid = 0; |
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|
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#ifdef CONFIG_SOCK_CGROUP_DATA |
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classid = sock_cgroup_classid(&sk->sk_cgrp_data); |
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#endif |
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/* Fallback to socket priority if class id isn't set. |
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* Classful qdiscs use it as direct reference to class. |
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* For cgroup2 classid is always zero. |
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*/ |
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if (!classid) |
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classid = sk->sk_priority; |
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|
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if (nla_put_u32(skb, INET_DIAG_CLASS_ID, classid)) |
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goto errout; |
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} |
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|
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#ifdef CONFIG_SOCK_CGROUP_DATA |
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if (nla_put_u64_64bit(skb, INET_DIAG_CGROUP_ID, |
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cgroup_id(sock_cgroup_ptr(&sk->sk_cgrp_data)), |
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INET_DIAG_PAD)) |
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goto errout; |
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#endif |
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|
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r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk)); |
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r->idiag_inode = sock_i_ino(sk); |
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|
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memset(&inet_sockopt, 0, sizeof(inet_sockopt)); |
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inet_sockopt.recverr = inet->recverr; |
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inet_sockopt.is_icsk = inet->is_icsk; |
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inet_sockopt.freebind = inet->freebind; |
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inet_sockopt.hdrincl = inet->hdrincl; |
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inet_sockopt.mc_loop = inet->mc_loop; |
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inet_sockopt.transparent = inet->transparent; |
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inet_sockopt.mc_all = inet->mc_all; |
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inet_sockopt.nodefrag = inet->nodefrag; |
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inet_sockopt.bind_address_no_port = inet->bind_address_no_port; |
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inet_sockopt.recverr_rfc4884 = inet->recverr_rfc4884; |
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inet_sockopt.defer_connect = inet->defer_connect; |
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if (nla_put(skb, INET_DIAG_SOCKOPT, sizeof(inet_sockopt), |
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&inet_sockopt)) |
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goto errout; |
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|
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return 0; |
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errout: |
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return 1; |
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} |
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EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill); |
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|
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static int inet_diag_parse_attrs(const struct nlmsghdr *nlh, int hdrlen, |
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struct nlattr **req_nlas) |
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{ |
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struct nlattr *nla; |
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int remaining; |
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|
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nlmsg_for_each_attr(nla, nlh, hdrlen, remaining) { |
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int type = nla_type(nla); |
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|
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if (type == INET_DIAG_REQ_PROTOCOL && nla_len(nla) != sizeof(u32)) |
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return -EINVAL; |
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|
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if (type < __INET_DIAG_REQ_MAX) |
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req_nlas[type] = nla; |
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} |
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return 0; |
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} |
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|
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static int inet_diag_get_protocol(const struct inet_diag_req_v2 *req, |
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const struct inet_diag_dump_data *data) |
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{ |
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if (data->req_nlas[INET_DIAG_REQ_PROTOCOL]) |
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return nla_get_u32(data->req_nlas[INET_DIAG_REQ_PROTOCOL]); |
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return req->sdiag_protocol; |
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} |
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|
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#define MAX_DUMP_ALLOC_SIZE (KMALLOC_MAX_SIZE - SKB_DATA_ALIGN(sizeof(struct skb_shared_info))) |
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|
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int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk, |
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struct sk_buff *skb, struct netlink_callback *cb, |
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const struct inet_diag_req_v2 *req, |
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u16 nlmsg_flags, bool net_admin) |
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{ |
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const struct tcp_congestion_ops *ca_ops; |
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const struct inet_diag_handler *handler; |
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struct inet_diag_dump_data *cb_data; |
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int ext = req->idiag_ext; |
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struct inet_diag_msg *r; |
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struct nlmsghdr *nlh; |
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struct nlattr *attr; |
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void *info = NULL; |
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|
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cb_data = cb->data; |
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handler = inet_diag_table[inet_diag_get_protocol(req, cb_data)]; |
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BUG_ON(!handler); |
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|
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nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, |
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cb->nlh->nlmsg_type, sizeof(*r), nlmsg_flags); |
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if (!nlh) |
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return -EMSGSIZE; |
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|
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r = nlmsg_data(nlh); |
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BUG_ON(!sk_fullsock(sk)); |
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|
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inet_diag_msg_common_fill(r, sk); |
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r->idiag_state = sk->sk_state; |
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r->idiag_timer = 0; |
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r->idiag_retrans = 0; |
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|
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if (inet_diag_msg_attrs_fill(sk, skb, r, ext, |
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sk_user_ns(NETLINK_CB(cb->skb).sk), |
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net_admin)) |
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goto errout; |
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|
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if (ext & (1 << (INET_DIAG_MEMINFO - 1))) { |
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struct inet_diag_meminfo minfo = { |
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.idiag_rmem = sk_rmem_alloc_get(sk), |
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.idiag_wmem = READ_ONCE(sk->sk_wmem_queued), |
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.idiag_fmem = sk->sk_forward_alloc, |
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.idiag_tmem = sk_wmem_alloc_get(sk), |
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}; |
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|
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if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0) |
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goto errout; |
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} |
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|
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if (ext & (1 << (INET_DIAG_SKMEMINFO - 1))) |
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if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO)) |
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goto errout; |
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|
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/* |
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* RAW sockets might have user-defined protocols assigned, |
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* so report the one supplied on socket creation. |
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*/ |
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if (sk->sk_type == SOCK_RAW) { |
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if (nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol)) |
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goto errout; |
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} |
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|
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if (!icsk) { |
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handler->idiag_get_info(sk, r, NULL); |
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goto out; |
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} |
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|
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if (icsk->icsk_pending == ICSK_TIME_RETRANS || |
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icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT || |
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icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) { |
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r->idiag_timer = 1; |
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r->idiag_retrans = icsk->icsk_retransmits; |
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r->idiag_expires = |
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jiffies_delta_to_msecs(icsk->icsk_timeout - jiffies); |
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} else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { |
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r->idiag_timer = 4; |
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r->idiag_retrans = icsk->icsk_probes_out; |
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r->idiag_expires = |
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jiffies_delta_to_msecs(icsk->icsk_timeout - jiffies); |
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} else if (timer_pending(&sk->sk_timer)) { |
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r->idiag_timer = 2; |
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r->idiag_retrans = icsk->icsk_probes_out; |
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r->idiag_expires = |
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jiffies_delta_to_msecs(sk->sk_timer.expires - jiffies); |
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} else { |
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r->idiag_timer = 0; |
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r->idiag_expires = 0; |
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} |
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|
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if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) { |
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attr = nla_reserve_64bit(skb, INET_DIAG_INFO, |
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handler->idiag_info_size, |
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INET_DIAG_PAD); |
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if (!attr) |
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goto errout; |
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|
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info = nla_data(attr); |
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} |
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|
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if (ext & (1 << (INET_DIAG_CONG - 1))) { |
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int err = 0; |
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|
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rcu_read_lock(); |
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ca_ops = READ_ONCE(icsk->icsk_ca_ops); |
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if (ca_ops) |
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err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name); |
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rcu_read_unlock(); |
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if (err < 0) |
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goto errout; |
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} |
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|
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handler->idiag_get_info(sk, r, info); |
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|
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if (ext & (1 << (INET_DIAG_INFO - 1)) && handler->idiag_get_aux) |
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if (handler->idiag_get_aux(sk, net_admin, skb) < 0) |
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goto errout; |
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|
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if (sk->sk_state < TCP_TIME_WAIT) { |
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union tcp_cc_info info; |
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size_t sz = 0; |
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int attr; |
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|
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rcu_read_lock(); |
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ca_ops = READ_ONCE(icsk->icsk_ca_ops); |
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if (ca_ops && ca_ops->get_info) |
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sz = ca_ops->get_info(sk, ext, &attr, &info); |
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rcu_read_unlock(); |
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if (sz && nla_put(skb, attr, sz, &info) < 0) |
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goto errout; |
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} |
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|
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/* Keep it at the end for potential retry with a larger skb, |
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* or else do best-effort fitting, which is only done for the |
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* first_nlmsg. |
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*/ |
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if (cb_data->bpf_stg_diag) { |
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bool first_nlmsg = ((unsigned char *)nlh == skb->data); |
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unsigned int prev_min_dump_alloc; |
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unsigned int total_nla_size = 0; |
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unsigned int msg_len; |
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int err; |
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|
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msg_len = skb_tail_pointer(skb) - (unsigned char *)nlh; |
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err = bpf_sk_storage_diag_put(cb_data->bpf_stg_diag, sk, skb, |
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INET_DIAG_SK_BPF_STORAGES, |
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&total_nla_size); |
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|
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if (!err) |
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goto out; |
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|
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total_nla_size += msg_len; |
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prev_min_dump_alloc = cb->min_dump_alloc; |
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if (total_nla_size > prev_min_dump_alloc) |
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cb->min_dump_alloc = min_t(u32, total_nla_size, |
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MAX_DUMP_ALLOC_SIZE); |
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|
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if (!first_nlmsg) |
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goto errout; |
|
|
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if (cb->min_dump_alloc > prev_min_dump_alloc) |
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/* Retry with pskb_expand_head() with |
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* __GFP_DIRECT_RECLAIM |
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*/ |
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goto errout; |
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|
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WARN_ON_ONCE(total_nla_size <= prev_min_dump_alloc); |
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|
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/* Send what we have for this sk |
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* and move on to the next sk in the following |
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* dump() |
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*/ |
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} |
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|
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out: |
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nlmsg_end(skb, nlh); |
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return 0; |
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|
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errout: |
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nlmsg_cancel(skb, nlh); |
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return -EMSGSIZE; |
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} |
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EXPORT_SYMBOL_GPL(inet_sk_diag_fill); |
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|
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static int inet_twsk_diag_fill(struct sock *sk, |
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struct sk_buff *skb, |
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struct netlink_callback *cb, |
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u16 nlmsg_flags, bool net_admin) |
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{ |
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struct inet_timewait_sock *tw = inet_twsk(sk); |
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struct inet_diag_msg *r; |
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struct nlmsghdr *nlh; |
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long tmo; |
|
|
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nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, |
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cb->nlh->nlmsg_seq, cb->nlh->nlmsg_type, |
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sizeof(*r), nlmsg_flags); |
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if (!nlh) |
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return -EMSGSIZE; |
|
|
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r = nlmsg_data(nlh); |
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BUG_ON(tw->tw_state != TCP_TIME_WAIT); |
|
|
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inet_diag_msg_common_fill(r, sk); |
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r->idiag_retrans = 0; |
|
|
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r->idiag_state = tw->tw_substate; |
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r->idiag_timer = 3; |
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tmo = tw->tw_timer.expires - jiffies; |
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r->idiag_expires = jiffies_delta_to_msecs(tmo); |
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r->idiag_rqueue = 0; |
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r->idiag_wqueue = 0; |
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r->idiag_uid = 0; |
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r->idiag_inode = 0; |
|
|
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if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, |
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tw->tw_mark)) { |
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nlmsg_cancel(skb, nlh); |
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return -EMSGSIZE; |
|
} |
|
|
|
nlmsg_end(skb, nlh); |
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return 0; |
|
} |
|
|
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static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb, |
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struct netlink_callback *cb, |
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u16 nlmsg_flags, bool net_admin) |
|
{ |
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struct request_sock *reqsk = inet_reqsk(sk); |
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struct inet_diag_msg *r; |
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struct nlmsghdr *nlh; |
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long tmo; |
|
|
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nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, |
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cb->nlh->nlmsg_type, sizeof(*r), nlmsg_flags); |
|
if (!nlh) |
|
return -EMSGSIZE; |
|
|
|
r = nlmsg_data(nlh); |
|
inet_diag_msg_common_fill(r, sk); |
|
r->idiag_state = TCP_SYN_RECV; |
|
r->idiag_timer = 1; |
|
r->idiag_retrans = reqsk->num_retrans; |
|
|
|
BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) != |
|
offsetof(struct sock, sk_cookie)); |
|
|
|
tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies; |
|
r->idiag_expires = jiffies_delta_to_msecs(tmo); |
|
r->idiag_rqueue = 0; |
|
r->idiag_wqueue = 0; |
|
r->idiag_uid = 0; |
|
r->idiag_inode = 0; |
|
|
|
if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, |
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inet_rsk(reqsk)->ir_mark)) { |
|
nlmsg_cancel(skb, nlh); |
|
return -EMSGSIZE; |
|
} |
|
|
|
nlmsg_end(skb, nlh); |
|
return 0; |
|
} |
|
|
|
static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, |
|
struct netlink_callback *cb, |
|
const struct inet_diag_req_v2 *r, |
|
u16 nlmsg_flags, bool net_admin) |
|
{ |
|
if (sk->sk_state == TCP_TIME_WAIT) |
|
return inet_twsk_diag_fill(sk, skb, cb, nlmsg_flags, net_admin); |
|
|
|
if (sk->sk_state == TCP_NEW_SYN_RECV) |
|
return inet_req_diag_fill(sk, skb, cb, nlmsg_flags, net_admin); |
|
|
|
return inet_sk_diag_fill(sk, inet_csk(sk), skb, cb, r, nlmsg_flags, |
|
net_admin); |
|
} |
|
|
|
struct sock *inet_diag_find_one_icsk(struct net *net, |
|
struct inet_hashinfo *hashinfo, |
|
const struct inet_diag_req_v2 *req) |
|
{ |
|
struct sock *sk; |
|
|
|
rcu_read_lock(); |
|
if (req->sdiag_family == AF_INET) |
|
sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0], |
|
req->id.idiag_dport, req->id.idiag_src[0], |
|
req->id.idiag_sport, req->id.idiag_if); |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
else if (req->sdiag_family == AF_INET6) { |
|
if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) && |
|
ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src)) |
|
sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3], |
|
req->id.idiag_dport, req->id.idiag_src[3], |
|
req->id.idiag_sport, req->id.idiag_if); |
|
else |
|
sk = inet6_lookup(net, hashinfo, NULL, 0, |
|
(struct in6_addr *)req->id.idiag_dst, |
|
req->id.idiag_dport, |
|
(struct in6_addr *)req->id.idiag_src, |
|
req->id.idiag_sport, |
|
req->id.idiag_if); |
|
} |
|
#endif |
|
else { |
|
rcu_read_unlock(); |
|
return ERR_PTR(-EINVAL); |
|
} |
|
rcu_read_unlock(); |
|
if (!sk) |
|
return ERR_PTR(-ENOENT); |
|
|
|
if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) { |
|
sock_gen_put(sk); |
|
return ERR_PTR(-ENOENT); |
|
} |
|
|
|
return sk; |
|
} |
|
EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk); |
|
|
|
int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, |
|
struct netlink_callback *cb, |
|
const struct inet_diag_req_v2 *req) |
|
{ |
|
struct sk_buff *in_skb = cb->skb; |
|
bool net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN); |
|
struct net *net = sock_net(in_skb->sk); |
|
struct sk_buff *rep; |
|
struct sock *sk; |
|
int err; |
|
|
|
sk = inet_diag_find_one_icsk(net, hashinfo, req); |
|
if (IS_ERR(sk)) |
|
return PTR_ERR(sk); |
|
|
|
rep = nlmsg_new(inet_sk_attr_size(sk, req, net_admin), GFP_KERNEL); |
|
if (!rep) { |
|
err = -ENOMEM; |
|
goto out; |
|
} |
|
|
|
err = sk_diag_fill(sk, rep, cb, req, 0, net_admin); |
|
if (err < 0) { |
|
WARN_ON(err == -EMSGSIZE); |
|
nlmsg_free(rep); |
|
goto out; |
|
} |
|
err = nlmsg_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid); |
|
|
|
out: |
|
if (sk) |
|
sock_gen_put(sk); |
|
|
|
return err; |
|
} |
|
EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk); |
|
|
|
static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb, |
|
const struct nlmsghdr *nlh, |
|
int hdrlen, |
|
const struct inet_diag_req_v2 *req) |
|
{ |
|
const struct inet_diag_handler *handler; |
|
struct inet_diag_dump_data dump_data; |
|
int err, protocol; |
|
|
|
memset(&dump_data, 0, sizeof(dump_data)); |
|
err = inet_diag_parse_attrs(nlh, hdrlen, dump_data.req_nlas); |
|
if (err) |
|
return err; |
|
|
|
protocol = inet_diag_get_protocol(req, &dump_data); |
|
|
|
handler = inet_diag_lock_handler(protocol); |
|
if (IS_ERR(handler)) { |
|
err = PTR_ERR(handler); |
|
} else if (cmd == SOCK_DIAG_BY_FAMILY) { |
|
struct netlink_callback cb = { |
|
.nlh = nlh, |
|
.skb = in_skb, |
|
.data = &dump_data, |
|
}; |
|
err = handler->dump_one(&cb, req); |
|
} else if (cmd == SOCK_DESTROY && handler->destroy) { |
|
err = handler->destroy(in_skb, req); |
|
} else { |
|
err = -EOPNOTSUPP; |
|
} |
|
inet_diag_unlock_handler(handler); |
|
|
|
return err; |
|
} |
|
|
|
static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits) |
|
{ |
|
int words = bits >> 5; |
|
|
|
bits &= 0x1f; |
|
|
|
if (words) { |
|
if (memcmp(a1, a2, words << 2)) |
|
return 0; |
|
} |
|
if (bits) { |
|
__be32 w1, w2; |
|
__be32 mask; |
|
|
|
w1 = a1[words]; |
|
w2 = a2[words]; |
|
|
|
mask = htonl((0xffffffff) << (32 - bits)); |
|
|
|
if ((w1 ^ w2) & mask) |
|
return 0; |
|
} |
|
|
|
return 1; |
|
} |
|
|
|
static int inet_diag_bc_run(const struct nlattr *_bc, |
|
const struct inet_diag_entry *entry) |
|
{ |
|
const void *bc = nla_data(_bc); |
|
int len = nla_len(_bc); |
|
|
|
while (len > 0) { |
|
int yes = 1; |
|
const struct inet_diag_bc_op *op = bc; |
|
|
|
switch (op->code) { |
|
case INET_DIAG_BC_NOP: |
|
break; |
|
case INET_DIAG_BC_JMP: |
|
yes = 0; |
|
break; |
|
case INET_DIAG_BC_S_EQ: |
|
yes = entry->sport == op[1].no; |
|
break; |
|
case INET_DIAG_BC_S_GE: |
|
yes = entry->sport >= op[1].no; |
|
break; |
|
case INET_DIAG_BC_S_LE: |
|
yes = entry->sport <= op[1].no; |
|
break; |
|
case INET_DIAG_BC_D_EQ: |
|
yes = entry->dport == op[1].no; |
|
break; |
|
case INET_DIAG_BC_D_GE: |
|
yes = entry->dport >= op[1].no; |
|
break; |
|
case INET_DIAG_BC_D_LE: |
|
yes = entry->dport <= op[1].no; |
|
break; |
|
case INET_DIAG_BC_AUTO: |
|
yes = !(entry->userlocks & SOCK_BINDPORT_LOCK); |
|
break; |
|
case INET_DIAG_BC_S_COND: |
|
case INET_DIAG_BC_D_COND: { |
|
const struct inet_diag_hostcond *cond; |
|
const __be32 *addr; |
|
|
|
cond = (const struct inet_diag_hostcond *)(op + 1); |
|
if (cond->port != -1 && |
|
cond->port != (op->code == INET_DIAG_BC_S_COND ? |
|
entry->sport : entry->dport)) { |
|
yes = 0; |
|
break; |
|
} |
|
|
|
if (op->code == INET_DIAG_BC_S_COND) |
|
addr = entry->saddr; |
|
else |
|
addr = entry->daddr; |
|
|
|
if (cond->family != AF_UNSPEC && |
|
cond->family != entry->family) { |
|
if (entry->family == AF_INET6 && |
|
cond->family == AF_INET) { |
|
if (addr[0] == 0 && addr[1] == 0 && |
|
addr[2] == htonl(0xffff) && |
|
bitstring_match(addr + 3, |
|
cond->addr, |
|
cond->prefix_len)) |
|
break; |
|
} |
|
yes = 0; |
|
break; |
|
} |
|
|
|
if (cond->prefix_len == 0) |
|
break; |
|
if (bitstring_match(addr, cond->addr, |
|
cond->prefix_len)) |
|
break; |
|
yes = 0; |
|
break; |
|
} |
|
case INET_DIAG_BC_DEV_COND: { |
|
u32 ifindex; |
|
|
|
ifindex = *((const u32 *)(op + 1)); |
|
if (ifindex != entry->ifindex) |
|
yes = 0; |
|
break; |
|
} |
|
case INET_DIAG_BC_MARK_COND: { |
|
struct inet_diag_markcond *cond; |
|
|
|
cond = (struct inet_diag_markcond *)(op + 1); |
|
if ((entry->mark & cond->mask) != cond->mark) |
|
yes = 0; |
|
break; |
|
} |
|
#ifdef CONFIG_SOCK_CGROUP_DATA |
|
case INET_DIAG_BC_CGROUP_COND: { |
|
u64 cgroup_id; |
|
|
|
cgroup_id = get_unaligned((const u64 *)(op + 1)); |
|
if (cgroup_id != entry->cgroup_id) |
|
yes = 0; |
|
break; |
|
} |
|
#endif |
|
} |
|
|
|
if (yes) { |
|
len -= op->yes; |
|
bc += op->yes; |
|
} else { |
|
len -= op->no; |
|
bc += op->no; |
|
} |
|
} |
|
return len == 0; |
|
} |
|
|
|
/* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV) |
|
*/ |
|
static void entry_fill_addrs(struct inet_diag_entry *entry, |
|
const struct sock *sk) |
|
{ |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
if (sk->sk_family == AF_INET6) { |
|
entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32; |
|
entry->daddr = sk->sk_v6_daddr.s6_addr32; |
|
} else |
|
#endif |
|
{ |
|
entry->saddr = &sk->sk_rcv_saddr; |
|
entry->daddr = &sk->sk_daddr; |
|
} |
|
} |
|
|
|
int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk) |
|
{ |
|
struct inet_sock *inet = inet_sk(sk); |
|
struct inet_diag_entry entry; |
|
|
|
if (!bc) |
|
return 1; |
|
|
|
entry.family = sk->sk_family; |
|
entry_fill_addrs(&entry, sk); |
|
entry.sport = inet->inet_num; |
|
entry.dport = ntohs(inet->inet_dport); |
|
entry.ifindex = sk->sk_bound_dev_if; |
|
entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0; |
|
if (sk_fullsock(sk)) |
|
entry.mark = sk->sk_mark; |
|
else if (sk->sk_state == TCP_NEW_SYN_RECV) |
|
entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark; |
|
else if (sk->sk_state == TCP_TIME_WAIT) |
|
entry.mark = inet_twsk(sk)->tw_mark; |
|
else |
|
entry.mark = 0; |
|
#ifdef CONFIG_SOCK_CGROUP_DATA |
|
entry.cgroup_id = sk_fullsock(sk) ? |
|
cgroup_id(sock_cgroup_ptr(&sk->sk_cgrp_data)) : 0; |
|
#endif |
|
|
|
return inet_diag_bc_run(bc, &entry); |
|
} |
|
EXPORT_SYMBOL_GPL(inet_diag_bc_sk); |
|
|
|
static int valid_cc(const void *bc, int len, int cc) |
|
{ |
|
while (len >= 0) { |
|
const struct inet_diag_bc_op *op = bc; |
|
|
|
if (cc > len) |
|
return 0; |
|
if (cc == len) |
|
return 1; |
|
if (op->yes < 4 || op->yes & 3) |
|
return 0; |
|
len -= op->yes; |
|
bc += op->yes; |
|
} |
|
return 0; |
|
} |
|
|
|
/* data is u32 ifindex */ |
|
static bool valid_devcond(const struct inet_diag_bc_op *op, int len, |
|
int *min_len) |
|
{ |
|
/* Check ifindex space. */ |
|
*min_len += sizeof(u32); |
|
if (len < *min_len) |
|
return false; |
|
|
|
return true; |
|
} |
|
/* Validate an inet_diag_hostcond. */ |
|
static bool valid_hostcond(const struct inet_diag_bc_op *op, int len, |
|
int *min_len) |
|
{ |
|
struct inet_diag_hostcond *cond; |
|
int addr_len; |
|
|
|
/* Check hostcond space. */ |
|
*min_len += sizeof(struct inet_diag_hostcond); |
|
if (len < *min_len) |
|
return false; |
|
cond = (struct inet_diag_hostcond *)(op + 1); |
|
|
|
/* Check address family and address length. */ |
|
switch (cond->family) { |
|
case AF_UNSPEC: |
|
addr_len = 0; |
|
break; |
|
case AF_INET: |
|
addr_len = sizeof(struct in_addr); |
|
break; |
|
case AF_INET6: |
|
addr_len = sizeof(struct in6_addr); |
|
break; |
|
default: |
|
return false; |
|
} |
|
*min_len += addr_len; |
|
if (len < *min_len) |
|
return false; |
|
|
|
/* Check prefix length (in bits) vs address length (in bytes). */ |
|
if (cond->prefix_len > 8 * addr_len) |
|
return false; |
|
|
|
return true; |
|
} |
|
|
|
/* Validate a port comparison operator. */ |
|
static bool valid_port_comparison(const struct inet_diag_bc_op *op, |
|
int len, int *min_len) |
|
{ |
|
/* Port comparisons put the port in a follow-on inet_diag_bc_op. */ |
|
*min_len += sizeof(struct inet_diag_bc_op); |
|
if (len < *min_len) |
|
return false; |
|
return true; |
|
} |
|
|
|
static bool valid_markcond(const struct inet_diag_bc_op *op, int len, |
|
int *min_len) |
|
{ |
|
*min_len += sizeof(struct inet_diag_markcond); |
|
return len >= *min_len; |
|
} |
|
|
|
#ifdef CONFIG_SOCK_CGROUP_DATA |
|
static bool valid_cgroupcond(const struct inet_diag_bc_op *op, int len, |
|
int *min_len) |
|
{ |
|
*min_len += sizeof(u64); |
|
return len >= *min_len; |
|
} |
|
#endif |
|
|
|
static int inet_diag_bc_audit(const struct nlattr *attr, |
|
const struct sk_buff *skb) |
|
{ |
|
bool net_admin = netlink_net_capable(skb, CAP_NET_ADMIN); |
|
const void *bytecode, *bc; |
|
int bytecode_len, len; |
|
|
|
if (!attr || nla_len(attr) < sizeof(struct inet_diag_bc_op)) |
|
return -EINVAL; |
|
|
|
bytecode = bc = nla_data(attr); |
|
len = bytecode_len = nla_len(attr); |
|
|
|
while (len > 0) { |
|
int min_len = sizeof(struct inet_diag_bc_op); |
|
const struct inet_diag_bc_op *op = bc; |
|
|
|
switch (op->code) { |
|
case INET_DIAG_BC_S_COND: |
|
case INET_DIAG_BC_D_COND: |
|
if (!valid_hostcond(bc, len, &min_len)) |
|
return -EINVAL; |
|
break; |
|
case INET_DIAG_BC_DEV_COND: |
|
if (!valid_devcond(bc, len, &min_len)) |
|
return -EINVAL; |
|
break; |
|
case INET_DIAG_BC_S_EQ: |
|
case INET_DIAG_BC_S_GE: |
|
case INET_DIAG_BC_S_LE: |
|
case INET_DIAG_BC_D_EQ: |
|
case INET_DIAG_BC_D_GE: |
|
case INET_DIAG_BC_D_LE: |
|
if (!valid_port_comparison(bc, len, &min_len)) |
|
return -EINVAL; |
|
break; |
|
case INET_DIAG_BC_MARK_COND: |
|
if (!net_admin) |
|
return -EPERM; |
|
if (!valid_markcond(bc, len, &min_len)) |
|
return -EINVAL; |
|
break; |
|
#ifdef CONFIG_SOCK_CGROUP_DATA |
|
case INET_DIAG_BC_CGROUP_COND: |
|
if (!valid_cgroupcond(bc, len, &min_len)) |
|
return -EINVAL; |
|
break; |
|
#endif |
|
case INET_DIAG_BC_AUTO: |
|
case INET_DIAG_BC_JMP: |
|
case INET_DIAG_BC_NOP: |
|
break; |
|
default: |
|
return -EINVAL; |
|
} |
|
|
|
if (op->code != INET_DIAG_BC_NOP) { |
|
if (op->no < min_len || op->no > len + 4 || op->no & 3) |
|
return -EINVAL; |
|
if (op->no < len && |
|
!valid_cc(bytecode, bytecode_len, len - op->no)) |
|
return -EINVAL; |
|
} |
|
|
|
if (op->yes < min_len || op->yes > len + 4 || op->yes & 3) |
|
return -EINVAL; |
|
bc += op->yes; |
|
len -= op->yes; |
|
} |
|
return len == 0 ? 0 : -EINVAL; |
|
} |
|
|
|
static void twsk_build_assert(void) |
|
{ |
|
BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) != |
|
offsetof(struct sock, sk_family)); |
|
|
|
BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) != |
|
offsetof(struct inet_sock, inet_num)); |
|
|
|
BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) != |
|
offsetof(struct inet_sock, inet_dport)); |
|
|
|
BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) != |
|
offsetof(struct inet_sock, inet_rcv_saddr)); |
|
|
|
BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) != |
|
offsetof(struct inet_sock, inet_daddr)); |
|
|
|
#if IS_ENABLED(CONFIG_IPV6) |
|
BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) != |
|
offsetof(struct sock, sk_v6_rcv_saddr)); |
|
|
|
BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) != |
|
offsetof(struct sock, sk_v6_daddr)); |
|
#endif |
|
} |
|
|
|
void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb, |
|
struct netlink_callback *cb, |
|
const struct inet_diag_req_v2 *r) |
|
{ |
|
bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN); |
|
struct inet_diag_dump_data *cb_data = cb->data; |
|
struct net *net = sock_net(skb->sk); |
|
u32 idiag_states = r->idiag_states; |
|
int i, num, s_i, s_num; |
|
struct nlattr *bc; |
|
struct sock *sk; |
|
|
|
bc = cb_data->inet_diag_nla_bc; |
|
if (idiag_states & TCPF_SYN_RECV) |
|
idiag_states |= TCPF_NEW_SYN_RECV; |
|
s_i = cb->args[1]; |
|
s_num = num = cb->args[2]; |
|
|
|
if (cb->args[0] == 0) { |
|
if (!(idiag_states & TCPF_LISTEN) || r->id.idiag_dport) |
|
goto skip_listen_ht; |
|
|
|
for (i = s_i; i < INET_LHTABLE_SIZE; i++) { |
|
struct inet_listen_hashbucket *ilb; |
|
struct hlist_nulls_node *node; |
|
|
|
num = 0; |
|
ilb = &hashinfo->listening_hash[i]; |
|
spin_lock(&ilb->lock); |
|
sk_nulls_for_each(sk, node, &ilb->nulls_head) { |
|
struct inet_sock *inet = inet_sk(sk); |
|
|
|
if (!net_eq(sock_net(sk), net)) |
|
continue; |
|
|
|
if (num < s_num) { |
|
num++; |
|
continue; |
|
} |
|
|
|
if (r->sdiag_family != AF_UNSPEC && |
|
sk->sk_family != r->sdiag_family) |
|
goto next_listen; |
|
|
|
if (r->id.idiag_sport != inet->inet_sport && |
|
r->id.idiag_sport) |
|
goto next_listen; |
|
|
|
if (!inet_diag_bc_sk(bc, sk)) |
|
goto next_listen; |
|
|
|
if (inet_sk_diag_fill(sk, inet_csk(sk), skb, |
|
cb, r, NLM_F_MULTI, |
|
net_admin) < 0) { |
|
spin_unlock(&ilb->lock); |
|
goto done; |
|
} |
|
|
|
next_listen: |
|
++num; |
|
} |
|
spin_unlock(&ilb->lock); |
|
|
|
s_num = 0; |
|
} |
|
skip_listen_ht: |
|
cb->args[0] = 1; |
|
s_i = num = s_num = 0; |
|
} |
|
|
|
if (!(idiag_states & ~TCPF_LISTEN)) |
|
goto out; |
|
|
|
#define SKARR_SZ 16 |
|
for (i = s_i; i <= hashinfo->ehash_mask; i++) { |
|
struct inet_ehash_bucket *head = &hashinfo->ehash[i]; |
|
spinlock_t *lock = inet_ehash_lockp(hashinfo, i); |
|
struct hlist_nulls_node *node; |
|
struct sock *sk_arr[SKARR_SZ]; |
|
int num_arr[SKARR_SZ]; |
|
int idx, accum, res; |
|
|
|
if (hlist_nulls_empty(&head->chain)) |
|
continue; |
|
|
|
if (i > s_i) |
|
s_num = 0; |
|
|
|
next_chunk: |
|
num = 0; |
|
accum = 0; |
|
spin_lock_bh(lock); |
|
sk_nulls_for_each(sk, node, &head->chain) { |
|
int state; |
|
|
|
if (!net_eq(sock_net(sk), net)) |
|
continue; |
|
if (num < s_num) |
|
goto next_normal; |
|
state = (sk->sk_state == TCP_TIME_WAIT) ? |
|
inet_twsk(sk)->tw_substate : sk->sk_state; |
|
if (!(idiag_states & (1 << state))) |
|
goto next_normal; |
|
if (r->sdiag_family != AF_UNSPEC && |
|
sk->sk_family != r->sdiag_family) |
|
goto next_normal; |
|
if (r->id.idiag_sport != htons(sk->sk_num) && |
|
r->id.idiag_sport) |
|
goto next_normal; |
|
if (r->id.idiag_dport != sk->sk_dport && |
|
r->id.idiag_dport) |
|
goto next_normal; |
|
twsk_build_assert(); |
|
|
|
if (!inet_diag_bc_sk(bc, sk)) |
|
goto next_normal; |
|
|
|
if (!refcount_inc_not_zero(&sk->sk_refcnt)) |
|
goto next_normal; |
|
|
|
num_arr[accum] = num; |
|
sk_arr[accum] = sk; |
|
if (++accum == SKARR_SZ) |
|
break; |
|
next_normal: |
|
++num; |
|
} |
|
spin_unlock_bh(lock); |
|
res = 0; |
|
for (idx = 0; idx < accum; idx++) { |
|
if (res >= 0) { |
|
res = sk_diag_fill(sk_arr[idx], skb, cb, r, |
|
NLM_F_MULTI, net_admin); |
|
if (res < 0) |
|
num = num_arr[idx]; |
|
} |
|
sock_gen_put(sk_arr[idx]); |
|
} |
|
if (res < 0) |
|
break; |
|
cond_resched(); |
|
if (accum == SKARR_SZ) { |
|
s_num = num + 1; |
|
goto next_chunk; |
|
} |
|
} |
|
|
|
done: |
|
cb->args[1] = i; |
|
cb->args[2] = num; |
|
out: |
|
; |
|
} |
|
EXPORT_SYMBOL_GPL(inet_diag_dump_icsk); |
|
|
|
static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, |
|
const struct inet_diag_req_v2 *r) |
|
{ |
|
struct inet_diag_dump_data *cb_data = cb->data; |
|
const struct inet_diag_handler *handler; |
|
u32 prev_min_dump_alloc; |
|
int protocol, err = 0; |
|
|
|
protocol = inet_diag_get_protocol(r, cb_data); |
|
|
|
again: |
|
prev_min_dump_alloc = cb->min_dump_alloc; |
|
handler = inet_diag_lock_handler(protocol); |
|
if (!IS_ERR(handler)) |
|
handler->dump(skb, cb, r); |
|
else |
|
err = PTR_ERR(handler); |
|
inet_diag_unlock_handler(handler); |
|
|
|
/* The skb is not large enough to fit one sk info and |
|
* inet_sk_diag_fill() has requested for a larger skb. |
|
*/ |
|
if (!skb->len && cb->min_dump_alloc > prev_min_dump_alloc) { |
|
err = pskb_expand_head(skb, 0, cb->min_dump_alloc, GFP_KERNEL); |
|
if (!err) |
|
goto again; |
|
} |
|
|
|
return err ? : skb->len; |
|
} |
|
|
|
static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) |
|
{ |
|
return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh)); |
|
} |
|
|
|
static int __inet_diag_dump_start(struct netlink_callback *cb, int hdrlen) |
|
{ |
|
const struct nlmsghdr *nlh = cb->nlh; |
|
struct inet_diag_dump_data *cb_data; |
|
struct sk_buff *skb = cb->skb; |
|
struct nlattr *nla; |
|
int err; |
|
|
|
cb_data = kzalloc(sizeof(*cb_data), GFP_KERNEL); |
|
if (!cb_data) |
|
return -ENOMEM; |
|
|
|
err = inet_diag_parse_attrs(nlh, hdrlen, cb_data->req_nlas); |
|
if (err) { |
|
kfree(cb_data); |
|
return err; |
|
} |
|
nla = cb_data->inet_diag_nla_bc; |
|
if (nla) { |
|
err = inet_diag_bc_audit(nla, skb); |
|
if (err) { |
|
kfree(cb_data); |
|
return err; |
|
} |
|
} |
|
|
|
nla = cb_data->inet_diag_nla_bpf_stgs; |
|
if (nla) { |
|
struct bpf_sk_storage_diag *bpf_stg_diag; |
|
|
|
bpf_stg_diag = bpf_sk_storage_diag_alloc(nla); |
|
if (IS_ERR(bpf_stg_diag)) { |
|
kfree(cb_data); |
|
return PTR_ERR(bpf_stg_diag); |
|
} |
|
cb_data->bpf_stg_diag = bpf_stg_diag; |
|
} |
|
|
|
cb->data = cb_data; |
|
return 0; |
|
} |
|
|
|
static int inet_diag_dump_start(struct netlink_callback *cb) |
|
{ |
|
return __inet_diag_dump_start(cb, sizeof(struct inet_diag_req_v2)); |
|
} |
|
|
|
static int inet_diag_dump_start_compat(struct netlink_callback *cb) |
|
{ |
|
return __inet_diag_dump_start(cb, sizeof(struct inet_diag_req)); |
|
} |
|
|
|
static int inet_diag_dump_done(struct netlink_callback *cb) |
|
{ |
|
struct inet_diag_dump_data *cb_data = cb->data; |
|
|
|
bpf_sk_storage_diag_free(cb_data->bpf_stg_diag); |
|
kfree(cb->data); |
|
|
|
return 0; |
|
} |
|
|
|
static int inet_diag_type2proto(int type) |
|
{ |
|
switch (type) { |
|
case TCPDIAG_GETSOCK: |
|
return IPPROTO_TCP; |
|
case DCCPDIAG_GETSOCK: |
|
return IPPROTO_DCCP; |
|
default: |
|
return 0; |
|
} |
|
} |
|
|
|
static int inet_diag_dump_compat(struct sk_buff *skb, |
|
struct netlink_callback *cb) |
|
{ |
|
struct inet_diag_req *rc = nlmsg_data(cb->nlh); |
|
struct inet_diag_req_v2 req; |
|
|
|
req.sdiag_family = AF_UNSPEC; /* compatibility */ |
|
req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type); |
|
req.idiag_ext = rc->idiag_ext; |
|
req.idiag_states = rc->idiag_states; |
|
req.id = rc->id; |
|
|
|
return __inet_diag_dump(skb, cb, &req); |
|
} |
|
|
|
static int inet_diag_get_exact_compat(struct sk_buff *in_skb, |
|
const struct nlmsghdr *nlh) |
|
{ |
|
struct inet_diag_req *rc = nlmsg_data(nlh); |
|
struct inet_diag_req_v2 req; |
|
|
|
req.sdiag_family = rc->idiag_family; |
|
req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type); |
|
req.idiag_ext = rc->idiag_ext; |
|
req.idiag_states = rc->idiag_states; |
|
req.id = rc->id; |
|
|
|
return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, |
|
sizeof(struct inet_diag_req), &req); |
|
} |
|
|
|
static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh) |
|
{ |
|
int hdrlen = sizeof(struct inet_diag_req); |
|
struct net *net = sock_net(skb->sk); |
|
|
|
if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX || |
|
nlmsg_len(nlh) < hdrlen) |
|
return -EINVAL; |
|
|
|
if (nlh->nlmsg_flags & NLM_F_DUMP) { |
|
struct netlink_dump_control c = { |
|
.start = inet_diag_dump_start_compat, |
|
.done = inet_diag_dump_done, |
|
.dump = inet_diag_dump_compat, |
|
}; |
|
return netlink_dump_start(net->diag_nlsk, skb, nlh, &c); |
|
} |
|
|
|
return inet_diag_get_exact_compat(skb, nlh); |
|
} |
|
|
|
static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h) |
|
{ |
|
int hdrlen = sizeof(struct inet_diag_req_v2); |
|
struct net *net = sock_net(skb->sk); |
|
|
|
if (nlmsg_len(h) < hdrlen) |
|
return -EINVAL; |
|
|
|
if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY && |
|
h->nlmsg_flags & NLM_F_DUMP) { |
|
struct netlink_dump_control c = { |
|
.start = inet_diag_dump_start, |
|
.done = inet_diag_dump_done, |
|
.dump = inet_diag_dump, |
|
}; |
|
return netlink_dump_start(net->diag_nlsk, skb, h, &c); |
|
} |
|
|
|
return inet_diag_cmd_exact(h->nlmsg_type, skb, h, hdrlen, |
|
nlmsg_data(h)); |
|
} |
|
|
|
static |
|
int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk) |
|
{ |
|
const struct inet_diag_handler *handler; |
|
struct nlmsghdr *nlh; |
|
struct nlattr *attr; |
|
struct inet_diag_msg *r; |
|
void *info = NULL; |
|
int err = 0; |
|
|
|
nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0); |
|
if (!nlh) |
|
return -ENOMEM; |
|
|
|
r = nlmsg_data(nlh); |
|
memset(r, 0, sizeof(*r)); |
|
inet_diag_msg_common_fill(r, sk); |
|
if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM) |
|
r->id.idiag_sport = inet_sk(sk)->inet_sport; |
|
r->idiag_state = sk->sk_state; |
|
|
|
if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) { |
|
nlmsg_cancel(skb, nlh); |
|
return err; |
|
} |
|
|
|
handler = inet_diag_lock_handler(sk->sk_protocol); |
|
if (IS_ERR(handler)) { |
|
inet_diag_unlock_handler(handler); |
|
nlmsg_cancel(skb, nlh); |
|
return PTR_ERR(handler); |
|
} |
|
|
|
attr = handler->idiag_info_size |
|
? nla_reserve_64bit(skb, INET_DIAG_INFO, |
|
handler->idiag_info_size, |
|
INET_DIAG_PAD) |
|
: NULL; |
|
if (attr) |
|
info = nla_data(attr); |
|
|
|
handler->idiag_get_info(sk, r, info); |
|
inet_diag_unlock_handler(handler); |
|
|
|
nlmsg_end(skb, nlh); |
|
return 0; |
|
} |
|
|
|
static const struct sock_diag_handler inet_diag_handler = { |
|
.family = AF_INET, |
|
.dump = inet_diag_handler_cmd, |
|
.get_info = inet_diag_handler_get_info, |
|
.destroy = inet_diag_handler_cmd, |
|
}; |
|
|
|
static const struct sock_diag_handler inet6_diag_handler = { |
|
.family = AF_INET6, |
|
.dump = inet_diag_handler_cmd, |
|
.get_info = inet_diag_handler_get_info, |
|
.destroy = inet_diag_handler_cmd, |
|
}; |
|
|
|
int inet_diag_register(const struct inet_diag_handler *h) |
|
{ |
|
const __u16 type = h->idiag_type; |
|
int err = -EINVAL; |
|
|
|
if (type >= IPPROTO_MAX) |
|
goto out; |
|
|
|
mutex_lock(&inet_diag_table_mutex); |
|
err = -EEXIST; |
|
if (!inet_diag_table[type]) { |
|
inet_diag_table[type] = h; |
|
err = 0; |
|
} |
|
mutex_unlock(&inet_diag_table_mutex); |
|
out: |
|
return err; |
|
} |
|
EXPORT_SYMBOL_GPL(inet_diag_register); |
|
|
|
void inet_diag_unregister(const struct inet_diag_handler *h) |
|
{ |
|
const __u16 type = h->idiag_type; |
|
|
|
if (type >= IPPROTO_MAX) |
|
return; |
|
|
|
mutex_lock(&inet_diag_table_mutex); |
|
inet_diag_table[type] = NULL; |
|
mutex_unlock(&inet_diag_table_mutex); |
|
} |
|
EXPORT_SYMBOL_GPL(inet_diag_unregister); |
|
|
|
static int __init inet_diag_init(void) |
|
{ |
|
const int inet_diag_table_size = (IPPROTO_MAX * |
|
sizeof(struct inet_diag_handler *)); |
|
int err = -ENOMEM; |
|
|
|
inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL); |
|
if (!inet_diag_table) |
|
goto out; |
|
|
|
err = sock_diag_register(&inet_diag_handler); |
|
if (err) |
|
goto out_free_nl; |
|
|
|
err = sock_diag_register(&inet6_diag_handler); |
|
if (err) |
|
goto out_free_inet; |
|
|
|
sock_diag_register_inet_compat(inet_diag_rcv_msg_compat); |
|
out: |
|
return err; |
|
|
|
out_free_inet: |
|
sock_diag_unregister(&inet_diag_handler); |
|
out_free_nl: |
|
kfree(inet_diag_table); |
|
goto out; |
|
} |
|
|
|
static void __exit inet_diag_exit(void) |
|
{ |
|
sock_diag_unregister(&inet6_diag_handler); |
|
sock_diag_unregister(&inet_diag_handler); |
|
sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat); |
|
kfree(inet_diag_table); |
|
} |
|
|
|
module_init(inet_diag_init); |
|
module_exit(inet_diag_exit); |
|
MODULE_LICENSE("GPL"); |
|
MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */); |
|
MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
|
|
|